Q1: In the On Play and When Digivolving effects of this card, which player chooses which hand to trash?
The opponent selects and trashes his or her own hand.
Lv.7 MoonMillenniummon BT19-075 SR Mega | Virus | Wicked God [Digivolve] [Millenniummon]: Cost 2 [On Play] [When Digivolving] Your opponent trashes cards in their hand until they have 5 left. For every 2 this effect trashed, delete 1 of your opponent's Tamers. [All Turns] When this Digimon would leave the battle area, by deleting 1 of your [Composite] trait Digimon, it doesn't leave. [All Turns] [Once Per Turn] When other Digimon or Tamers are deleted, trash your opponent's top security card.
Lv.7 MoonMillenniummon BT19-075 SR Mega | Virus | Wicked God [Digivolve] [Millenniummon]: Cost 2 [On Play] [When Digivolving] Your opponent trashes cards in their hand until they have 5 left. For every 2 this effect trashed, delete 1 of your opponent's Tamers. [All Turns] When this Digimon would leave the battle area, by deleting 1 of your [Composite] trait Digimon, it doesn't leave. [All Turns] [Once Per Turn] When other Digimon or Tamers are deleted, trash your opponent's top security card.
Lv.7 MoonMillenniummon BT19-075 SR Mega | Virus | Wicked God [Digivolve] [Millenniummon]: Cost 2 [On Play] [When Digivolving] Your opponent trashes cards in their hand until they have 5 left. For every 2 cards trashed by this effect, delete 1 of your opponent's Tamers. [All Turns] When this Digimon would leave the battle area, by deleting 1 of your Digimon with the [Composite] trait Digimon, it doesn't leave. [All Turns] [Once Per Turn] When other Digimon or Tamers are deleted, trash your opponent's top security card.
Lv.7 ムーンミレニアモン BT19-075 SR 究極体 | ウィルス種 | 邪神型 「ミレニアモン」:コスト2 【登場時】【進化時】相手は自身の手札が5枚になるように手札を破棄する。この効果で破棄した2枚ごとに、相手のテイマー1体を消滅させる。 【お互いのターン】このデジモンがバトルエリアを離れるとき、特徴に「合成型」を持つ自分のデジモン1体を消滅させることで、離れない。 【お互いのターン】[ターンに1回]他のデジモン/テイマーが消滅したとき、相手のセキュリティを上から1枚破棄する。